Baffin Women's Sage Insulated Active Boot 100% Synthetic Imported Synthetic sole Shaft measures approximately 8" from arch Boot opening measures approximately 12" around Revolutionary self-molding foam based multi-layer inner boot that is removable for quick dry time Comfort range between 41 degrees fahrenheit and negative 20 degrees fahrenheit Cold tested base and high-traction outsole Quick pull lacing system with lace lock for assured fit Waterproof materials and construction